Roof truss cables must be removed.
Some builders remove them and some don't.
But leaving roof truss cables exposed just provides another unwanted penetration through the roof, with shingles that are never going to glue down flat.
Shingles that are not flat are wind vulnerable.
And leak vulnerable.
Any roof can leak at any time depending on the force and direction of rain. Winds can blow hard, and the rain will go where it is blown.
If there is a penetration through any roof with points of vulnerability - be it a skylight, plumbing penetration tube, ridge vent, or even loose shingles - there is the potential for leaking, and damage.
This roof had two cables like the one in the photo. This is a new construction and these cables were seen during a pre-drywall inspection. The supervisor said that cables left in this way "have always been fine."
When viewing the long run the word "fine" simply cannot be used. The word "always" should likely not be used in any roof context!
My recommendation: a pre-drywall inspection can reveal things that appear innocent but in reality are not. And buyers seeing this sort of thing, and hearing from the trusted supervisor that it would be "fine," simply move on. It was much easier to remove this cable prior to shingles, but now is the time to do it anyway.
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